It may be a of hyperthyroidism.
It’s natural for your weight to fluctuate throughout the year. Maybe you eat a bit too much during the holidays and gain a bit of weight, or you come down with the stomach flu and end up dropping a few pounds—a slight swing on the scale is normal and nothing to worry about.
But if you drop at least five percent of your body weight in less than six months—and you can’t pinpoint a good explanation for that weight loss—it’s time to let your doctor know what’s up, says Anne Cappola, MD, an endocrinologist and professor of medicine at the University of Pennsylvania. That means if you’re 150 pounds, a weight fluctuation of about seven or eight pounds in a short amount of time should be a red flag.
“It’s not common to lose a significant amount of weight without an obvious reason,” Dr. Cappola says. “If you’re losing weight and nothing’s changed with your diet or activity, you need to worry about that a little bit.”
In fact, unexplained weight loss could be an early sign of a serious health condition, says Kerry Hildreth, MD, an assistant professor of geriatric medicine at the University of Colorado. Here, eight health issues that could explain why you’re losing weight so suddenly.